SDL: Make sure the palette is no longer in use before freeing it in the Vulkan renderer

SDL Commits
1 
From 04b2fb80469cdc9a82309f0c6a559c4e7eef9ba0 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 10 Sep 2026 12:18:40 -0700
Subject: [PATCH] Make sure the palette is no longer in use before freeing it
 in the Vulkan renderer

Fixes https://github.com/libsdl-org/SDL/issues/16283
---
 src/render/vulkan/SDL_render_vulkan.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/render/vulkan/SDL_render_vulkan.c b/src/render/vulkan/SDL_render_vulkan.c
index 9be5117116e91..2a5c4db155513 100644
--- a/src/render/vulkan/SDL_render_vulkan.c
+++ b/src/render/vulkan/SDL_render_vulkan.c
@@ -2638,10 +2638,17 @@ static void VULKAN_DestroyPalette(SDL_Renderer *renderer, SDL_TexturePalette *pa
     VULKAN_RenderData *data = (VULKAN_RenderData *)renderer->internal;
     VULKAN_PaletteData *palettedata = (VULKAN_PaletteData *)palette->internal;
 
-    if (palettedata) {
-        VULKAN_DestroyImage(data, &palettedata->image);
-        SDL_free(palettedata);
+    if (!palettedata) {
+        return;
     }
+
+    /* Because VULKAN_DestroyPalette might be called while the data is in-flight, we need to issue the batch first
+       Unfortunately, this means that deleting a lot of palettes mid-frame will have poor performance. */
+    VULKAN_IssueBatch(data);
+    VULKAN_WaitForGPU(data);
+
+    VULKAN_DestroyImage(data, &palettedata->image);
+    SDL_free(palettedata);
 }
 
 static bool VULKAN_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture, SDL_PropertiesID create_props)